Separation of aromatic/aliphatic mixtures by pervaporation using ortho-functionalized polyimide membranes

Claudio P. Ribeiro, Benny D. Freeman, Douglass S. Kalika, Sumod Kalakkunnath

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

2 Citations (Scopus)


The performance of a series of soluble aromatic polyimides for the separation of benzene/n-heptane and toluene/n-heptane mixtures by pervaporation is reported. Homo- and random copolyimides were synthesized by a two-step polycondensation of three aromatic dianhydrides (6FDA, ODPA, BTDA) and five aromatic diamines (APAF, HAB, 3MPD, 4MPD, and FDA). Pervaporation experiments were performed at 80°C with feed streams containing 40 wt% aromatics. All polymers were selective towards the aromatic hydrocarbon, whose permeability could be changed by 4 orders of magnitude depending upon the chemical structure of the diamine. Pure-liquid sorption experiments at 25°C revealed that these large changes in hydrocarbon permeability were mainly caused by changes in the diffusion coefficient. The performance of the synthesized materials was compared with previous results reported for other polymers, as well as with the performance of Matrimid®, a commercial polyimide.

Original languageEnglish
Title of host publicationModern Applications in Membrane Science and Technology
PublisherAmerican Chemical Society
Number of pages25
ISBN (Print)9780841226180
Publication statusPublished - 2011
Externally publishedYes

Publication series

NameACS Symposium Series
ISSN (Print)0097-6156
ISSN (Electronic)1947-5918

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